7. Now you're ready to put the cover back on. Make sure you fit the cover back on the way it's supposed to be...specifically tucking the cover under this plastic duct piece:

8. Screw all the screws in and viola! All done. Enjoy!

NB: Be sure you line up the grooves of the cover with the tongue that runs along the edge of the bottom, especially at the left (the grille intake duct) when seating the cover, or the screws will miss their seats. It took a couple of tries before I got it seated right.

The flutter won't happen if the box is completely fitted. Sometimes when you put it on, there's a space (tiny) between the front snorkle and inner bend where the airbox meet that the grove isn't clicked in. You'll see that the box has a very small groove for this purpose, but it's trickly to lock it in perfectly.

Does anyone know if the filter comes pre-oiled?
It's not clear from the included instructions if pre-oiling is necessary.

Anyone? I ordered the aFe oiled version, but it didn't come in a plastic bag inside the box, as with other oiled filters I ordered in the past. It doesn't feel terribly oily to the touch either. Thoughts?

No worries... mine was oiled. #1, it's more blue than grey, and #2, some of the oil seeped out onto the instructions (making them blue), sooooo... all is well in my world. And thanks for the DIY... it made my life a LOT easier!!!

i'd love someone to figure out what percentage of air comes from which intake
i'd guess 80% is from #3 and maybe 15% from #2 with the rest coming from #1

no engineers who could figure this out?

There are a lot of variables. Mainly speed. But it could be figured out in certain scenarios. Ive actually had water come up from #1 when i drive after rain or something. it almost seems like its more of an exit to keep air flowing but im sure it does suck in when that engine wants air. I have yet to take it all apart to see

many thanks to the OP and BADFISH for the instructions! It made the job so much easier. Special thanks to Badfish for the 25 size Torx and loosening the larger hose clamp instead of the smaller one...worked like a charm!

Nice writeup - provides confidence to know that this is drop-dead simple and quick. I spent a little extra cleaning all the different intake tubing since it looked like a leaf & sand storm had blown threw.

I simply went with a new stock filter. $23: acceleration sounds more visceral and aggressive; MPGs have soared to where I can't remember the last fill up; +11.3 shp (Seat Horse Power measured via butt-dyno™). Seriously though, for that price I'll replace this about twice per year and have the confidence that I'm properly filtering what goes in my out-of-warranty engine.

Great DIY, thanks! I had to go back and reinstall the cover after missing step 7 and also found it easier to disconnect the rubber pipe at both ends. FWIW, my '11 also required a Torx 25 instead of a 20.